Hello rodolf_lum and welcome to the forum!
Honestly, I can hardly find my way through your text block - and I don’t really understand what you are talking about, it could be because I have a fever, but mainly I have a hard time grasping this paragraphless text.
If you’re looking for an eraser like Photoshop offers, I’ll have to refer you to a plugin since Krita doesn’t have that functionality. (It was created to accommodate people with a desire for a Photoshop-like eraser (that’s my interpretation).)
Regarding the shortcuts in Krita, in addition to the “Keyboard Shortcuts” there is also the “Canvas Input Settings” where you can customize “painting related” shortcuts, i.e. shortcuts that “take place on the canvas”, like “Pan” and “Zoom”. Take a look inside, and you will grasp their meaning.
But I don’t understand why you want to customize the name of the shortcut, isn’t it enough to be able to assign the shortcut according to your preferences?
Could you possibly explain your wish differently, or are there other users who understand what @rodolf_lum is asking or looking for, I am currently overwhelmed?
Michelist
Addendum: This is mainly a computer translation, because I have a fever and feel weak, and apologize for this.